This is an extremely fun game and a fun way to get the idea of 'Human Environment Interaction' to your students. Easily the most relevant Theme of Geography for students, this is a great way to introduce the topic.
There are 10 Questions, each with 2 truths and 1 lie. They have to guess which statement is the lie, and then switch papers with someone else. They grade each other, and when you go over the answers (end of slideshow, fully animated and interactive) you can discuss how the truths are impacting us as humans.